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Aquarium  Phosphorous  Photophore

Photoperiod or Lighting Duration
For most aquariums, you will want to have the lights on for 10-12 hours per day, however, if you are growing live plants or live corals, you may want to increase this light duration to 12-14 hours per day.

Photoperiod: Refers to the number of consecutive hours that light occurs in a day. In the aquarium, it is the number of hours that the lights are kept on.
Photophore: Luminous organ found in fish.

Photoperiod: The length of time that the aquarium lights are on.
Phytoplankton: Microscopic plants found drifting in seawater.

The period of time that an aquariums lights remain on. For your basic Aquarium, it is recommended to only have the light on for 6 hours each day. Reef Tanks have seperate specifications depending on the life in the tank.

Photoperiod = Gk word that is used for the periods of light and darkness within a day
Photophore = Gk term for the organs that produce bioluminescence light of specific animals ...

The photoperiod or amount of time you should leave your lights on is worth mention as well. A photoperiod of 10--12 hours is considered the best for plant tanks; use a timer to control consistency.

Regularity of photoperiod can be very meaningful. Experiments have shown that long dark or light periods (1-2 days) severely affect aquatic life, photosynthetic and otherwise.

'Cryptocaryon irritans (Ciliophora): Photoperiod and Transmission in Marine Fish.' Journal of the Marine Biological Association of the United Kingdom, 74, 445-453, 1994b.
Burgess, P.J. & Matthews R.A.

With lighting, we want to provide the proper photoperiod, intensity, and spectrum for good coral and anemone growth. Most applications use a 12-hour photoperiod.

- This can be difficult, but if possible, reduce the length or intensity of your photoperiod. Opt for less light demanding and maintenance intensive plants. Or, switch to more efficient lights.

Keep feeds at regular hours, and make sure the photoperiod (lights on time!) is regular, around 12 hours a day ( reflective of equatorial times for most tropical fish, and this is most important for wild collected fish ), and if at all possible, ...

For most aquarists, a simple, inexpensive 15 amp timer found at any hardware store will suffice for controlling the length of the photoperiod.

Is lighting sufficiently intense for your plant choices, of good spectrum for plants, and for a long enough photoperiod? Are you giving root plants such as swords and crypts and aponogetons some root fertilization?

Some vendors have attached timers to these hoods to facilitate the setting of photoperiod exposures. Fish do not need more than 12 hours of light each day, so a preset timer can be a convenient gadget.

Sure, they don't crawl under the covers and go to sleep, but they do hunker down in a quite place and rest at night. They need this period without lights. A good photoperiod (time the lights are on) is around 10 hours per day.

Use warmer 78F water, well planted with finely leaved vegetation. The baby Zebra Danios grow quickly and reach maturity within eight months. Photoperiod is very important 14 hours of light and 10 hours of dark will induce spawning.

Limnophilia sessiliflora has an interesting habit. When the plant has received enough light for the day, the whorls of leaves tend to close up and "go to sleep". You can use this to help fine tune the photoperiod in your tank.

See also: See also: Water, Aquarium, Fish, Plants, Temperature

Aquarium  Phosphorous  Photophore

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